They do have their own basic lives and will play and have fun in their cage which is fun to watch for a bit, but ultimately do not bring a whole lot of gameplay to the game.

They all use the same basic cage, and cannot roam your house in balls or freely they are either being played with by your Sim or are in their cage. While they can be a fun little diversion for the day to day of your Sims’ lives, they ultimately do not do much and only add maybe a couple hours of gameplay if you are lucky. My First Pet Stuff pack is a fun and unique little pack that gives you four different little critters to own, such as pygmy hedgehogs, rats, miniature bubalus, and hamsters. With the My First Pet Stuff DLC that has changed and I fear it may lead the game down a very scary and dark path. I have never had a problem with this as I have always been able to pick and choose what I wanted to have and not having something didn’t affect anything else in the game. The Sims franchise is notorious for DLC and expansions, and The Sims 4 has only ramped that up.

Sims 4 pet stuff pack